Heat pipe-attached heat sink

ABSTRACT

A heat pipe-attached heat sink includes a bottom block having an opening and locating grooves arranged on the flat bottom wall thereof, a radiation fin module consisting of first radiation fins and second radiation fins, each first radiation fin having extension abutment strip that has a flat bottom abutment edge and locating grooves located on the flat bottom abutment edge and dividing the flat bottom abutment edge into a plurality of spacer ribs, the extension abutment strips of the first radiation being tightly plugged into the opening of the bottom block, and heat pipes respectively press-fitted into the locating grooves of the bottom block and the locating grooves of the first radiation fins of the radiation fin module, each heat pipe having a planar peripheral side exposed outside the radiation fin module and the bottom block and kept in flush with the flat bottom abutment edge of the extension abutment strips for direct contact with an external heat source.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to heat sink technology and moreparticularly, to a heat pipe-attached heat sink, which keeps theattached heat pipes in flush with a flat bottom abutment edge of anextension abutment strip of each radiation fin for direct contact with aheat source for quick transfer of waste head.

(b) Description of the Prior Art

A conventional heat pipe attached heat sink is known comprising: aradiation fin module, one of a number of heat pipes and a metal bottomblock. During application, the bottom block is kept in direct contactwith the heat source, enabling waste heat to be transferred by thebottom block to the radiation fins of the radiation fin module throughthe heat pipe(s) for quick dissipation. This design of heat sinkutilizes the bottom block, the heat pipe(s) and the radiation fin moduleto transfer heat in proper order. However, this heat transfer method hasa low heat dissipation speed and performance. There is known anotherprior art heat sink design, which eliminates the use of a metal bottomblock and has the heat-absorbing end of each heat pipe be directlypress-fitted into a respective mounting groove on each of a number ofradiation fins. After connection between heat pipes and radiation fins,heat pipes are kept flattened and kept in parallel for direct contactwith the heat source for quick transfer of waste heat from the heatsource to the radiation fins for quick dissipation. According to thisdesign, the radiation fins are not directly kept in contact with thesurface of the heat source for direct dissipation of waste heat.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances inview. It is the main object of the present invention to provide a heatpipe-attached heat sink, which eliminates the drawbacks of the aforesaidvarious prior art designs.

To achieve this and other objects of the present invention, a heatpipe-attached heat sink comprises a bottom block, a radiation fin moduleand one or a number of heat pipes. The bottom block comprises an openingcut through opposing flat top and bottom walls thereof and a pluralityof locating grooves arranged on the flat bottom wall and extended to theopening. The radiation fin module is fastened to the bottom block,comprising a plurality of first radiation fins and second radiation finsarranged in a stack. Each first radiation fin comprises an extensionabutment strip. The extension abutment strip comprises a flat bottomabutment edge, and a plurality of locating grooves located on the flatbottom abutment edge and dividing the flat bottom abutment edge into aplurality of spacer ribs, Further, the extension abutment strips of thefirst radiation fins form a protruding block that is tightly pluggedinto the opening of the bottom block. The heat pipes are respectivelypress-fitted into the locating grooves of the bottom block and thelocating grooves of the extension abutment strips of the first radiationfins of the radiation fin module. Each heat pipe comprises a planarperipheral side exposed outside the radiation fin module and the bottomblock for direct contact with an external heat source. Thus, the flatbottom abutment edge of the extension abutment strip of each firstradiation fin, the flat bottom wall of the bottom block and the planarperipheral side of each heat pipe form a coplane for direct contact withthe external heat source for quick dissipation of waste heat from theexternal heat source.

Further, the extension abutment strip of each first radiation fincomprises at least one locating rib formed in each locating groove atthe flat bottom abutment edge thereof for engagement with the peripheryof the heat pipes. Further, the bottom block comprises at least onelocating rib formed in each locating groove at the flat bottom wallthereof for engagement with the periphery of the heat pipes.

Further, the bottom block further comprises a plurality of spacer ribsformed of the flat bottom wall thereof and respectively disposed betweeneach two adjacent ones of the locating grooves of the bottom blockcorresponding to the spacer ribs of the extension abutment strips of thefirst radiation fins of the radiation fin module.

Further, the spacer ribs of the first radiation fins have a heightsmaller than the depth of the locating grooves of the first radiationfins. Further, the spacer ribs of said bottom block have a heightsmaller than the depth of the locating grooves of said bottom block.

Further, each heat pipe comprises a flat protruding peripheral portionprotruding over the flat bottom wall of said bottom block; the flatbottom abutment edges of the extension abutment strips of said firstradiation fins of said radiation fin module protrude over the flatbottom wall of said bottom block and are kept in flush with the flatprotruding peripheral portions of said heat pipes.

Further, the bottom block comprises a plurality of mounting holes formounting.

Further, the bottom block can be made having a plurality of retainingholes for receiving the first radiation fins and second radiation finsof the radiation fin module tightly.

In an alternate form of the present invention, the heat pipe-attachedheat sink further comprises a second radiation fin module. In this case,the heat pipes each have one end thereof respectively extended out ofthe bottom block and fastened to the second radiation fin module.

Further, the first radiation fins and second radiation fins of theradiation fin module can be made having a plurality of through holes. Inthis case, the heat pipes are U-shaped pipes each having one end thereoffastened to the locating grooves of the first radiation fins and thelocating grooves of the bottom block and an opposite end thereofrespectively and tightly press-fitted into the through holes of thefirst radiation fins and second radiation fins of the radiation finmodule.

In still another alternate form of the present invention, the heat pipeseach have a heat-receiving end press-fitted into the locating grooves ofthe first radiation fins and the locating grooves of the bottom blockand a flat protruding peripheral portion located on the heat-receivingend and protruding over the flat bottom wall of the bottom block at apredetermined distance.

In still another alternate form of the present invention, the bottomblock comprises a flat protrusion protruded from the flat bottom wallthereof and abutted to the opening. Further, the locating grooves of thebottom block are located on the flat protrusion. In this case, thelocating grooves of the first radiation fins of the radiation fin moduleand the locating grooves of the bottom block are disposed at differentelevations.

Further, the flat protrusion of the bottom block defines a flat contactsurface corresponding to the flat bottom abutment edges of the extensionabutment strips of the first radiation fins of the radiation fin module.Further, the flat contact surface of the flat protrusion of the bottomblock and the flat bottom abutment edges of the extension abutmentstrips of the first radiation fins of the radiation fin module aredisposed at different elevations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a heat pipe-attached heat sink inaccordance with a first embodiment of the present invention.

FIG. 2 is an elevational assembly view of the heat pipe-attached heatsink in accordance with the first embodiment of the present invention.

FIG. 3 is a top view of the heat pipe-attached heat sink in accordancewith the first embodiment of the present invention.

FIG. 4 is a sectional view taken along line A-A of FIG. 1.

FIG. 5 is an elevational view of one radiation fin for the heatpipe-attached heat sink in accordance with the first embodiment of thepresent invention.

FIG. 6 is a top view of a heat pipe-attached heat sink in accordancewith a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line A-A of FIG. 6.

FIG. 8 is an elevational assembly view of a heat pipe-attached heat sinkin accordance with a third embodiment of the present invention.

FIG. 9 is a side view of the heat pipe-attached heat sink in accordancewith the third embodiment of the present invention.

FIG. 10 is an elevational view of a heat pipe-attached heat sink inaccordance with a fourth embodiment of the present invention.

FIG. 11 is a side view of the heat pipe-attached heat sink in accordancewith the fourth embodiment of the present invention.

FIG. 12 is an elevational view of a heat pipe-attached heat sink inaccordance with a fifth embodiment of the present invention.

FIG. 13 is a side view of the heat pipe-attached heat sink in accordancewith the fifth embodiment of the present invention.

FIG. 14 is an elevational view of a heat pipe-attached heat sink inaccordance with a sixth embodiment of the present invention.

FIG. 15 is a side view of the heat pipe-attached heat sink in accordancewith the sixth embodiment of the present invention.

FIG. 16 is an elevational view of a heat pipe-attached heat sink inaccordance with a seventh embodiment of the present invention.

FIG. 17 is a side view of the heat pipe-attached heat sink in accordancewith the seventh embodiment of the present invention.

FIG. 18 is an elevational view of a heat pipe-attached heat sink inaccordance with an eighth embodiment of the present invention beforeinstallation of heat pipes.

FIG. 19 is a side view of FIG. 18.

FIG. 20 is a top view of the heat pipe-attached heat sink in accordancewith the eighth embodiment of the present invention after installationof heat pipes.

FIG. 21 is a sectional view taken along line A-A of FIG. 29.

FIG. 22 is an elevational view of the heat pipe-attached heat sink inaccordance with the eighth embodiment of the present invention afterinstallation of heat pipes.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1-4, a heat pipe-attached heat sink in accordancewith a first embodiment of the present invention is shown comprising aradiation fin module 10, at least one heat pipes 20 and a bottom block30.

The radiation fin module 10 consists of a plurality of first and secondradiation fins 1; 1 a arranged in a stack. Each first radiation fin 1comprises an extension abutment strip 11, as shown in FIG. 5. Theextension abutment strip 11 comprises a flat bottom abutment edge 111and a plurality of locating grooves 112 located on the flat bottomabutment edge 111. The flat bottom abutment edge 111 is divided by thelocating grooves 112 into a plurality of spacer ribs 113. When the firstand second radiation fins 1; 1 a are arranged together in a stack, theextension abutment strips 11 of the first radiation fins 1 form aprotruding block 101, and the locating grooves 112 of each firstradiation fin 1 are respectively kept in alignment with that of theother first radiation fins 1.

The heat pipes 20 each have a planar peripheral side respectively keptin a flush manner.

The bottom block 30 comprises an opening 31 cut through opposing flattop and bottom walls thereof, a plurality of locating grooves 32arranged on the flat bottom wall at one or two opposite sides relativeto the opening 31, and a plurality of mounting holes 33 cut through theflat top and bottom walls and spaced around the opening 31.

During installation, the first and second radiation fins 1; 1 a arestacked up to form the designed radiation fin module 10, and thenpress-fit the protruding block 101 of the radiation fin module 10 intothe opening 31 of the bottom block 30 to keep the locating grooves 32 inalignment with the locating grooves 112 of the extension abutment strips11 of the first radiation fins 1 of the radiation fin module 10, andthen attach the heat pipes 20 to the flat bottom wall of the bottomblock 30 and the extension abutment strips 11 of the first radiationfins 1 of the radiation fin module 10 to force the heat pipes 20 intotight engagement with the locating grooves 32 of the bottom block 30 andthe locating grooves 112 of the extension abutment strips 11 of thefirst radiation fins 1 of the radiation fin module 10, keeping theplanar peripheral wall of each of heat pipes 20 and the flat bottomabutment edges 111 of the extension abutment strips 11 in flush with theflat bottom wall of the bottom block 30 for direct contact with the heatsource to minimize impedance during heat transfer, eliminating thedrawback of indirect heat transfer arrangement of the prior art designand enhancing heat transfer speed and heat dissipation performance.

As shown in FIG. 5, the protruding block 101 of the radiation fin module10 has a cross section approximately equal to the cross dimension of theopening 31 of the bottom block 30. When press-fitting the protrudingblock 101 into the opening 31 of the bottom block 30, the protrudingblock 101 fills up the opening 31, and the flat bottom abutment edges111 of the extension abutment strips 11 of the radiation fin module 10form with the planar peripheral side of each of the heat pipes 20 andthe flat bottom wall of the bottom block 30 a co-plane for directcontact with the heat source for quick transfer of waste heat from theheat source.

The extension abutment strip 11 of each first radiation fin 1 furthercomprises at least one locating rib 114 formed in each locating groove112 at the flat bottom abutment edge 111 by stamping technology (seeFIG. 5). When press-fitting the heat pipes 20 into the locating grooves112, the locating ribs 114 are deformed and forced into engagement withthe periphery of the respective heat pipes 20, enhancing connectiontightness between the heat pipes 20 and the radiation fins 1. Locatingribs 321 can be formed in the locating grooves 32 of the bottom block 30corresponding to the locating ribs 114 by stamping technology forengagement with the heat pipes 20 to enhance connection tightnessbetween the heat pipes 20 and the bottom block 30.

As stated above, the flat bottom abutment edge 111 of the extensionabutment strip 11 of each first radiation fin 1 is divided by thelocating grooves 112 into multiple spacer ribs 113. After the heat pipes20 are press-fitted into the locating grooves 32 of the bottom block 30and the locating grooves 112 of the extension abutment strips 11 of thefirst radiation fins 1 of the radiation fin module 10, the heat pipes 20are kept in parallel in a flush manner and spaced from one another bythe spacer ribs 113, and therefore a gap D is left between each twoadjacent heat pipes 20 in the area beyond the protruding block 101 ofthe radiation fin module 10 (see FIG. 3).

Further, when making the locating grooves 32 on the flat bottom wall ofthe bottom block 30, spacer ribs 322 are formed of the flat bottom wallof the bottom block 30 and respectively disposed between each twoadjacent ones of the locating grooves 32 corresponding to the spacerribs 113 of the extension abutment strips 11 of the first radiation fins1.

FIGS. 6 and 7 illustrate a heat pipe-attached heat sink in accordancewith a second embodiment of the present invention. According to thissecond embodiment, the height of the spacer ribs 113 a between each twoadjacent ones of the locating grooves 112 of the extension abutmentstrips 11 of the first radiation fins 1 is shorter than the depth of thelocating grooves 112. After installation of the heat pipes 20 in thebottom block 30 and the radiation fin module 10, the heat pipes 20 arekept in close contact with one another in a parallel and flush manner.Further, the height of the spacer ribs 322 of the bottom block 30 issmaller than the locating grooves 32 so that the heat pipes 20 can becompletely kept in close contact with one another in a parallel andflush manner.

FIGS. 8 and 9 illustrate a heat pipe-attached heat sink in accordancewith a third embodiment of the present invention. This third embodimentis substantially similar to the aforesaid first embodiment with theexception that each heat pipe 20 has a flat protruding peripheralportion 201 protruding over the flat bottom wall of the bottom block 30at a height H; the flat bottom abutment edges 111 of the extensionabutment strips 11 of the first radiation fins 1 of the radiation finmodule 10 protrude over the flat bottom wall of the bottom block 30 atthe same height H and kept in flush with the flat protruding peripheralportions 201 of the heat pipes 20 (see FIG. 9). Thus, the flatprotruding peripheral portions 201 of the heat pipes 20 and the flatbottom abutment edges 111 of the extension abutment strips 11 of thefirst radiation fins 1 of the radiation fin module 10 constitute aprotruding platform for direct contact with a heat source duringapplication, avoiding installation interference of surroundingelectronic component parts.

Further, the design of the mounting holes 33 of the bottom block 30facilitates installation of a fan bracket or connection of the heat sinkto a circuit substrate or selected member during application.

Except the aforesaid press-fit connection method to join the radiationfins 1; 1 a of the radiation fin module 10 and the bottom block 30, thebottom block 30 can be made having retaining holes for receiving theradiation fins 1; 1 a of the radiation fin module 10. By means ofplugging the radiation fins 1; 1 a into the retaining holes on thebottom block 30, the radiation fins 1; 1 a of the radiation fin module10 are firmly secured to the bottom block 30.

FIGS. 10 and 11 illustrate a heat pipe-attached heat sink in accordancewith a fourth embodiment of the present invention. According to thisembodiment, the heat pipe-attached heat sink comprises a bottom block30, a first radiation fin module 10 fastened to the bottom block 30, asecond radiation fin module 10 a spaced from the first radiation finmodule 10 and the bottom block 30 at a distance, and a plurality of heatpipes 20; 20 a fastened with the respective heat-receiving ends thereofto the first radiation fin module 10 and the bottom block 30 and withthe respective cold ends 21 a thereof to the second radiation fin module10 a.

FIGS. 12 and 13 illustrate a heat pipe-attached heat sink in accordancewith a fifth embodiment of the present invention. This fifth embodimentis substantially similar to the aforesaid fourth embodiment with theexception that each heat pipe 20 b has a flat protruding peripheralportion 201 b protruding over the flat bottom wall of the bottom block30 at a height H; the flat bottom abutment edges 111 of the extensionabutment strips 11 of the first radiation fins 1 of the first radiationfin module 10 protrude over the flat bottom wall of the bottom block 30at the same height H and kept in flush with the flat protrudingperipheral portions 201 b of the heat pipes 20 b. Thus, the flatprotruding middle peripheral portions 201 b of the heat pipes 20 b andthe flat bottom abutment edges 111 of the extension abutment strips 11of the first radiation fins 1 of the first radiation fin module 10constitute a protruding platform for direct contact with a heat sourceduring application, avoiding installation interference of surroundingelectronic component parts.

FIGS. 14 and 15 illustrate a heat pipe-attached heat sink in accordancewith a sixth embodiment of the present invention. According to thisembodiment, the heat pipe-attached heat sink comprises a bottom block30, a first radiation fin module 10 fastened to the bottom block 30, asecond radiation fin modules 10 b and a third radiation fin modules 10 carranged at two opposite lateral sides relative to the first radiationfin module 10 and the bottom block 30, and a plurality of heat pipes 20c installed in the first radiation fin module 10 and the bottom block 30and connected with the respective two opposite ends 21 c to the secondradiation fin modules 10 b and the third radiation fin modules 10 c.

FIGS. 16 and 17 illustrate a heat pipe-attached heat sink in accordancewith a seventh embodiment of the present invention. This seventhembodiment is substantially similar to the aforesaid sixth embodimentwith the exception that each heat pipe 20 c has a flat protrudingperipheral portion 201 c protruding over the flat bottom wall of thebottom block 30 at a height H; the flat bottom abutment edges 111 of theextension abutment strips of the radiation fins 1 of the first radiationfin module 10 protrude over the flat bottom wall of the bottom block 30at the same height H and kept in flush with the flat protrudingperipheral portions 201 c of the heat pipes 20 c. Thus, the flatprotruding middle peripheral portions 201 c of the heat pipes 20 c andthe flat bottom abutment edges 111 of the extension abutment strips 11of the radiation fins 1 of the first radiation fin module 10 constitutea protruding platform for direct contact with a heat source duringapplication, avoiding installation interference of surroundingelectronic component parts.

FIGS. 18˜22 illustrate a heat pipe-attached heat sink in accordance withan eighth embodiment of the present invention. According to thisembodiment, the heat pipe-attached heat sink comprises a radiation finmodule 10 e, a plurality of heat pipes 20 e and a bottom block 30 e.

The radiation fin module 10 e consists of a plurality of radiation fins1 e arranged in a stack. Each radiation fin 1 e comprises an extensionabutment strip 11 e. The extension abutment strip 11 e has a flat bottomabutment edge 111 e and a plurality of locating grooves 112 e located onthe flat bottom abutment edge 111 e. The flat bottom abutment edge 111 eis divided by the locating grooves 112 e into a plurality of spacer ribs113 e. When the radiation fins 1 e are arranged together in a stack, theextension abutment strips 11 e of the radiation fins 1 e form aprotruding block 101 e, and the locating grooves 112 e of each radiationfin 1 e are respectively kept in alignment with that of the otherradiation fins 1 e. Each radiation fin 1 e further comprises a pluralityof through holes 115 e for the insertion of the heat pipes 20 e.

The heat pipes 20 e are U-shaped pipes, each having its one end, namely,the heat-receiving end respectively press-fitted into the locatinggrooves 112 e of the radiation fin 1 e of the radiation fin module 10 eand its other end, namely, the heat-releasing end respectively andtightly inserted into the through holes 115 e of the radiation fins 1 eof the radiation fin module 10 e. Further, each heat pipe 20 e has aflat protruding peripheral portion 201 e.

The bottom block 30 e comprises an opening 31 e cut through opposingflat top and bottom walls thereof, a flat protrusion 301 e protrudedfrom the flat bottom wall thereof at one or two opposite sides relativeto the opening 31 e, and a plurality of locating grooves 32 e located onthe flat protrusion 301 e corresponding to the locating grooves 112 e ofthe radiation fin 1 e of the radiation fin module 10 e. The flatprotrusion 301 e defines a flat contact surface 302 e. There is anelevation difference H1 between the locating grooves 32 e of the bottomblock 30 and the elevation of the locating grooves 112 e of theradiation fin 1 e of the radiation fin module 10 e, and an elevationdifference H2 between the flat contact surface 302 e of the flatprotrusion 301 e and the flat bottom abutment edge 111 e of theextension abutment strips 11 e of the radiation fin 1 e of the radiationfin module 10 e. Thus, the flat bottom abutment edge 111 e of theextension abutment strips 11 e of the radiation fin 1 e of the radiationfin module 10 e and the flat protruding peripheral portion 201 e of theheat pipes 20 e form a coplane at a relatively higher elevation than theother part of the flat peripheral surface area of each of the heat pipes20 e.

Although particular embodiments of the invention have been described indetail for purposes of illustration, various modifications andenhancements may be made without departing from the spirit and scope ofthe invention. Accordingly, the invention is not to be limited except asby the appended claims.

1. A heat pipe-attached heat sink, comprising: a bottom block comprisingan opening cut through opposing flat top and bottom walls thereof and aplurality of locating grooves arranged on the flat bottom wall andextended to said opening; a radiation fin module fastened to said bottomblock, said radiation fin module comprising a plurality of firstradiation fins and second radiation fins arranged in a stack, each saidfirst radiation fin comprising an extension abutment strip, saidextension abutment strip comprising a flat bottom abutment edge and aplurality of locating grooves located on said flat bottom abutment edgeand dividing said flat bottom abutment edge into a plurality of spacerribs, the extension abutment strips of said first radiation fins forminga protruding block and being tightly plugged into the opening of saidbottom block; and a plurality of heat pipes respectively press-fittedinto the locating grooves of said bottom block and the locating groovesof the extension abutment strips of said first radiation fins of saidradiation fin module, each said heat pipe comprising a planar peripheralside exposed outside said radiation fin module and said bottom block fordirect contact with an external heat source.
 2. The heat pipe-attachedheat sink as claimed in claim 1, wherein the flat bottom abutment edgeof the extension abutment strip of each said first radiation fin, theflat bottom wall of said bottom block and the planar peripheral side ofeach said heat pipe form a coplane.
 3. The heat pipe-attached heat sinkas claimed in claim 1, wherein the extension abutment strip of each saidfirst radiation fin further comprises at least one locating rib formedin each locating groove at the flat bottom abutment edge thereof forengagement with the periphery of said heat pipes.
 4. The heatpipe-attached heat sink as claimed in claim 1, wherein said bottom blockfurther comprises at least one locating rib formed in each locatinggroove at the flat bottom wall thereof for engagement with the peripheryof said heat pipes.
 5. The heat pipe-attached heat sink as claimed inclaim 1, wherein said bottom block further comprises a plurality ofspacer ribs formed of the flat bottom wall thereof and respectivelydisposed between each two adjacent ones of the locating grooves of saidbottom block corresponding to the spacer ribs of the extension abutmentstrips of said first radiation fins of said radiation fin module.
 6. Theheat pipe-attached heat sink as claimed in claim 1, wherein the spacerribs of said first radiation fins have a height smaller than the depthof the locating grooves of said first radiation fins.
 7. The heatpipe-attached heat sink as claimed in claim 5, wherein the spacer ribsof said bottom block have a height smaller than the depth of thelocating grooves of said bottom block.
 8. The heat pipe-attached heatsink as claimed in claim 1, wherein each said heat pipe comprises a flatprotruding peripheral portion protruding over the flat bottom wall ofsaid bottom block; the flat bottom abutment edges of the extensionabutment strips of said first radiation fins of said radiation finmodule protrude over the flat bottom wall of said bottom block and arekept in flush with the flat protruding peripheral portions of said heatpipes.
 9. The heat pipe-attached heat sink as claimed in claim 1,wherein said bottom block further comprises a plurality of mountingholes for mounting.
 10. The heat pipe-attached heat sink as claimed inclaim 1, wherein said bottom block further comprises a plurality ofretaining holes for receiving said first radiation fins and secondradiation fins of said radiation fin module tightly.
 11. The heatpipe-attached heat sink as claimed in claim 1, further comprising asecond radiation fin module, wherein said heat pipes each have one endthereof respectively extended out of said bottom block and fastened tosaid second radiation fin module.
 12. The heat pipe-attached heat sinkas claimed in claim 1, wherein said first radiation fins and secondradiation fins of said radiation fin module each comprise a plurality ofthrough holes; said heat pipes are U-shaped pipes each having one endthereof fastened to the locating grooves of said first radiation finsand the locating grooves of said bottom block and an opposite endthereof respectively and tightly press-fitted into the through holes ofsaid first radiation fins and second radiation fins of said radiationfin module.
 13. The heat pipe-attached heat sink as claimed in claim 1,wherein said heat pipes each have a heat-receiving end press-fitted intothe locating grooves of said first radiation fins and the locatinggrooves of said bottom block and a flat protruding peripheral portionlocated on said heat-receiving end and protruding over the flat bottomwall of said bottom block at a predetermined distance.
 14. The heatpipe-attached heat sink as claimed in claim 1, wherein said bottom blockcomprises a flat protrusion protruded from the flat bottom wall thereofand abutted to said opening; the locating grooves of said bottom blockare located on said flat protrusion.
 15. The heat pipe-attached heatsink as claimed in claim 14, wherein the locating grooves of said firstradiation fins of said radiation fin module and the locating grooves ofsaid bottom block are disposed at different elevations.
 16. The heatpipe-attached heat sink as claimed in claim 14, wherein said flatprotrusion of said bottom block defines a flat contact surfacecorresponding to the flat bottom abutment edges of the extensionabutment strips of said first radiation fins of said radiation finmodule.
 17. The heat pipe-attached heat sink as claimed in claim 16,wherein the flat contact surface of said flat protrusion of said bottomblock and the flat bottom abutment edges of the extension abutmentstrips of said first radiation fins of said radiation fin module aredisposed at different elevations.